1 | // SPDX-License-Identifier: GPL-2.0 |
2 | /* |
3 | * Greybus "AP" USB driver for "ES2" controller chips |
4 | * |
5 | * Copyright 2014-2015 Google Inc. |
6 | * Copyright 2014-2015 Linaro Ltd. |
7 | */ |
8 | #include <linux/kthread.h> |
9 | #include <linux/sizes.h> |
10 | #include <linux/usb.h> |
11 | #include <linux/kfifo.h> |
12 | #include <linux/debugfs.h> |
13 | #include <linux/list.h> |
14 | #include <linux/greybus.h> |
15 | #include <asm/unaligned.h> |
16 | |
17 | #include "arpc.h" |
18 | #include "greybus_trace.h" |
19 | |
20 | |
21 | /* Default timeout for USB vendor requests. */ |
22 | #define ES2_USB_CTRL_TIMEOUT 500 |
23 | |
24 | /* Default timeout for ARPC CPort requests */ |
25 | #define ES2_ARPC_CPORT_TIMEOUT 500 |
26 | |
27 | /* Fixed CPort numbers */ |
28 | #define ES2_CPORT_CDSI0 16 |
29 | #define ES2_CPORT_CDSI1 17 |
30 | |
31 | /* Memory sizes for the buffers sent to/from the ES2 controller */ |
32 | #define ES2_GBUF_MSG_SIZE_MAX 2048 |
33 | |
34 | /* Memory sizes for the ARPC buffers */ |
35 | #define ARPC_OUT_SIZE_MAX U16_MAX |
36 | #define ARPC_IN_SIZE_MAX 128 |
37 | |
38 | static const struct usb_device_id id_table[] = { |
39 | { USB_DEVICE(0x18d1, 0x1eaf) }, |
40 | { }, |
41 | }; |
42 | MODULE_DEVICE_TABLE(usb, id_table); |
43 | |
44 | #define APB1_LOG_SIZE SZ_16K |
45 | |
46 | /* |
47 | * Number of CPort IN urbs in flight at any point in time. |
48 | * Adjust if we are having stalls in the USB buffer due to not enough urbs in |
49 | * flight. |
50 | */ |
51 | #define NUM_CPORT_IN_URB 4 |
52 | |
53 | /* Number of CPort OUT urbs in flight at any point in time. |
54 | * Adjust if we get messages saying we are out of urbs in the system log. |
55 | */ |
56 | #define NUM_CPORT_OUT_URB 8 |
57 | |
58 | /* |
59 | * Number of ARPC in urbs in flight at any point in time. |
60 | */ |
61 | #define NUM_ARPC_IN_URB 2 |
62 | |
63 | /* |
64 | * @endpoint: bulk in endpoint for CPort data |
65 | * @urb: array of urbs for the CPort in messages |
66 | * @buffer: array of buffers for the @cport_in_urb urbs |
67 | */ |
68 | struct es2_cport_in { |
69 | __u8 endpoint; |
70 | struct urb *urb[NUM_CPORT_IN_URB]; |
71 | u8 *buffer[NUM_CPORT_IN_URB]; |
72 | }; |
73 | |
74 | /** |
75 | * struct es2_ap_dev - ES2 USB Bridge to AP structure |
76 | * @usb_dev: pointer to the USB device we are. |
77 | * @usb_intf: pointer to the USB interface we are bound to. |
78 | * @hd: pointer to our gb_host_device structure |
79 | * |
80 | * @cport_in: endpoint, urbs and buffer for cport in messages |
81 | * @cport_out_endpoint: endpoint for cport out messages |
82 | * @cport_out_urb: array of urbs for the CPort out messages |
83 | * @cport_out_urb_busy: array of flags to see if the @cport_out_urb is busy or |
84 | * not. |
85 | * @cport_out_urb_cancelled: array of flags indicating whether the |
86 | * corresponding @cport_out_urb is being cancelled |
87 | * @cport_out_urb_lock: locks the @cport_out_urb_busy "list" |
88 | * @cdsi1_in_use: true if cport CDSI1 is in use |
89 | * @apb_log_task: task pointer for logging thread |
90 | * @apb_log_dentry: file system entry for the log file interface |
91 | * @apb_log_enable_dentry: file system entry for enabling logging |
92 | * @apb_log_fifo: kernel FIFO to carry logged data |
93 | * @arpc_urb: array of urbs for the ARPC in messages |
94 | * @arpc_buffer: array of buffers for the @arpc_urb urbs |
95 | * @arpc_endpoint_in: bulk in endpoint for APBridgeA RPC |
96 | * @arpc_id_cycle: gives an unique id to ARPC |
97 | * @arpc_lock: locks ARPC list |
98 | * @arpcs: list of in progress ARPCs |
99 | */ |
100 | struct es2_ap_dev { |
101 | struct usb_device *usb_dev; |
102 | struct usb_interface *usb_intf; |
103 | struct gb_host_device *hd; |
104 | |
105 | struct es2_cport_in cport_in; |
106 | __u8 cport_out_endpoint; |
107 | struct urb *cport_out_urb[NUM_CPORT_OUT_URB]; |
108 | bool cport_out_urb_busy[NUM_CPORT_OUT_URB]; |
109 | bool cport_out_urb_cancelled[NUM_CPORT_OUT_URB]; |
110 | spinlock_t cport_out_urb_lock; |
111 | |
112 | bool cdsi1_in_use; |
113 | |
114 | struct task_struct *apb_log_task; |
115 | struct dentry *apb_log_dentry; |
116 | struct dentry *apb_log_enable_dentry; |
117 | DECLARE_KFIFO(apb_log_fifo, char, APB1_LOG_SIZE); |
118 | |
119 | __u8 arpc_endpoint_in; |
120 | struct urb *arpc_urb[NUM_ARPC_IN_URB]; |
121 | u8 *arpc_buffer[NUM_ARPC_IN_URB]; |
122 | |
123 | int arpc_id_cycle; |
124 | spinlock_t arpc_lock; |
125 | struct list_head arpcs; |
126 | }; |
127 | |
128 | struct arpc { |
129 | struct list_head list; |
130 | struct arpc_request_message *req; |
131 | struct arpc_response_message *resp; |
132 | struct completion response_received; |
133 | bool active; |
134 | }; |
135 | |
136 | static inline struct es2_ap_dev *hd_to_es2(struct gb_host_device *hd) |
137 | { |
138 | return (struct es2_ap_dev *)&hd->hd_priv; |
139 | } |
140 | |
141 | static void cport_out_callback(struct urb *urb); |
142 | static void usb_log_enable(struct es2_ap_dev *es2); |
143 | static void usb_log_disable(struct es2_ap_dev *es2); |
144 | static int arpc_sync(struct es2_ap_dev *es2, u8 type, void *payload, |
145 | size_t size, int *result, unsigned int timeout); |
146 | |
147 | static int output_sync(struct es2_ap_dev *es2, void *req, u16 size, u8 cmd) |
148 | { |
149 | struct usb_device *udev = es2->usb_dev; |
150 | u8 *data; |
151 | int retval; |
152 | |
153 | data = kmemdup(p: req, size, GFP_KERNEL); |
154 | if (!data) |
155 | return -ENOMEM; |
156 | |
157 | retval = usb_control_msg(dev: udev, usb_sndctrlpipe(udev, 0), |
158 | request: cmd, |
159 | USB_DIR_OUT | USB_TYPE_VENDOR | |
160 | USB_RECIP_INTERFACE, |
161 | value: 0, index: 0, data, size, ES2_USB_CTRL_TIMEOUT); |
162 | if (retval < 0) |
163 | dev_err(&udev->dev, "%s: return error %d\n" , __func__, retval); |
164 | else |
165 | retval = 0; |
166 | |
167 | kfree(objp: data); |
168 | return retval; |
169 | } |
170 | |
171 | static void ap_urb_complete(struct urb *urb) |
172 | { |
173 | struct usb_ctrlrequest *dr = urb->context; |
174 | |
175 | kfree(objp: dr); |
176 | usb_free_urb(urb); |
177 | } |
178 | |
179 | static int output_async(struct es2_ap_dev *es2, void *req, u16 size, u8 cmd) |
180 | { |
181 | struct usb_device *udev = es2->usb_dev; |
182 | struct urb *urb; |
183 | struct usb_ctrlrequest *dr; |
184 | u8 *buf; |
185 | int retval; |
186 | |
187 | urb = usb_alloc_urb(iso_packets: 0, GFP_ATOMIC); |
188 | if (!urb) |
189 | return -ENOMEM; |
190 | |
191 | dr = kmalloc(size: sizeof(*dr) + size, GFP_ATOMIC); |
192 | if (!dr) { |
193 | usb_free_urb(urb); |
194 | return -ENOMEM; |
195 | } |
196 | |
197 | buf = (u8 *)dr + sizeof(*dr); |
198 | memcpy(buf, req, size); |
199 | |
200 | dr->bRequest = cmd; |
201 | dr->bRequestType = USB_DIR_OUT | USB_TYPE_VENDOR | USB_RECIP_INTERFACE; |
202 | dr->wValue = 0; |
203 | dr->wIndex = 0; |
204 | dr->wLength = cpu_to_le16(size); |
205 | |
206 | usb_fill_control_urb(urb, dev: udev, usb_sndctrlpipe(udev, 0), |
207 | setup_packet: (unsigned char *)dr, transfer_buffer: buf, buffer_length: size, |
208 | complete_fn: ap_urb_complete, context: dr); |
209 | retval = usb_submit_urb(urb, GFP_ATOMIC); |
210 | if (retval) { |
211 | usb_free_urb(urb); |
212 | kfree(objp: dr); |
213 | } |
214 | return retval; |
215 | } |
216 | |
217 | static int output(struct gb_host_device *hd, void *req, u16 size, u8 cmd, |
218 | bool async) |
219 | { |
220 | struct es2_ap_dev *es2 = hd_to_es2(hd); |
221 | |
222 | if (async) |
223 | return output_async(es2, req, size, cmd); |
224 | |
225 | return output_sync(es2, req, size, cmd); |
226 | } |
227 | |
228 | static int es2_cport_in_enable(struct es2_ap_dev *es2, |
229 | struct es2_cport_in *cport_in) |
230 | { |
231 | struct urb *urb; |
232 | int ret; |
233 | int i; |
234 | |
235 | for (i = 0; i < NUM_CPORT_IN_URB; ++i) { |
236 | urb = cport_in->urb[i]; |
237 | |
238 | ret = usb_submit_urb(urb, GFP_KERNEL); |
239 | if (ret) { |
240 | dev_err(&es2->usb_dev->dev, |
241 | "failed to submit in-urb: %d\n" , ret); |
242 | goto err_kill_urbs; |
243 | } |
244 | } |
245 | |
246 | return 0; |
247 | |
248 | err_kill_urbs: |
249 | for (--i; i >= 0; --i) { |
250 | urb = cport_in->urb[i]; |
251 | usb_kill_urb(urb); |
252 | } |
253 | |
254 | return ret; |
255 | } |
256 | |
257 | static void es2_cport_in_disable(struct es2_ap_dev *es2, |
258 | struct es2_cport_in *cport_in) |
259 | { |
260 | struct urb *urb; |
261 | int i; |
262 | |
263 | for (i = 0; i < NUM_CPORT_IN_URB; ++i) { |
264 | urb = cport_in->urb[i]; |
265 | usb_kill_urb(urb); |
266 | } |
267 | } |
268 | |
269 | static int es2_arpc_in_enable(struct es2_ap_dev *es2) |
270 | { |
271 | struct urb *urb; |
272 | int ret; |
273 | int i; |
274 | |
275 | for (i = 0; i < NUM_ARPC_IN_URB; ++i) { |
276 | urb = es2->arpc_urb[i]; |
277 | |
278 | ret = usb_submit_urb(urb, GFP_KERNEL); |
279 | if (ret) { |
280 | dev_err(&es2->usb_dev->dev, |
281 | "failed to submit arpc in-urb: %d\n" , ret); |
282 | goto err_kill_urbs; |
283 | } |
284 | } |
285 | |
286 | return 0; |
287 | |
288 | err_kill_urbs: |
289 | for (--i; i >= 0; --i) { |
290 | urb = es2->arpc_urb[i]; |
291 | usb_kill_urb(urb); |
292 | } |
293 | |
294 | return ret; |
295 | } |
296 | |
297 | static void es2_arpc_in_disable(struct es2_ap_dev *es2) |
298 | { |
299 | struct urb *urb; |
300 | int i; |
301 | |
302 | for (i = 0; i < NUM_ARPC_IN_URB; ++i) { |
303 | urb = es2->arpc_urb[i]; |
304 | usb_kill_urb(urb); |
305 | } |
306 | } |
307 | |
308 | static struct urb *next_free_urb(struct es2_ap_dev *es2, gfp_t gfp_mask) |
309 | { |
310 | struct urb *urb = NULL; |
311 | unsigned long flags; |
312 | int i; |
313 | |
314 | spin_lock_irqsave(&es2->cport_out_urb_lock, flags); |
315 | |
316 | /* Look in our pool of allocated urbs first, as that's the "fastest" */ |
317 | for (i = 0; i < NUM_CPORT_OUT_URB; ++i) { |
318 | if (!es2->cport_out_urb_busy[i] && |
319 | !es2->cport_out_urb_cancelled[i]) { |
320 | es2->cport_out_urb_busy[i] = true; |
321 | urb = es2->cport_out_urb[i]; |
322 | break; |
323 | } |
324 | } |
325 | spin_unlock_irqrestore(lock: &es2->cport_out_urb_lock, flags); |
326 | if (urb) |
327 | return urb; |
328 | |
329 | /* |
330 | * Crap, pool is empty, complain to the syslog and go allocate one |
331 | * dynamically as we have to succeed. |
332 | */ |
333 | dev_dbg(&es2->usb_dev->dev, |
334 | "No free CPort OUT urbs, having to dynamically allocate one!\n" ); |
335 | return usb_alloc_urb(iso_packets: 0, mem_flags: gfp_mask); |
336 | } |
337 | |
338 | static void free_urb(struct es2_ap_dev *es2, struct urb *urb) |
339 | { |
340 | unsigned long flags; |
341 | int i; |
342 | /* |
343 | * See if this was an urb in our pool, if so mark it "free", otherwise |
344 | * we need to free it ourselves. |
345 | */ |
346 | spin_lock_irqsave(&es2->cport_out_urb_lock, flags); |
347 | for (i = 0; i < NUM_CPORT_OUT_URB; ++i) { |
348 | if (urb == es2->cport_out_urb[i]) { |
349 | es2->cport_out_urb_busy[i] = false; |
350 | urb = NULL; |
351 | break; |
352 | } |
353 | } |
354 | spin_unlock_irqrestore(lock: &es2->cport_out_urb_lock, flags); |
355 | |
356 | /* If urb is not NULL, then we need to free this urb */ |
357 | usb_free_urb(urb); |
358 | } |
359 | |
360 | /* |
361 | * We (ab)use the operation-message header pad bytes to transfer the |
362 | * cport id in order to minimise overhead. |
363 | */ |
364 | static void |
365 | gb_message_cport_pack(struct gb_operation_msg_hdr *, u16 cport_id) |
366 | { |
367 | header->pad[0] = cport_id; |
368 | } |
369 | |
370 | /* Clear the pad bytes used for the CPort id */ |
371 | static void gb_message_cport_clear(struct gb_operation_msg_hdr *) |
372 | { |
373 | header->pad[0] = 0; |
374 | } |
375 | |
376 | /* Extract the CPort id packed into the header, and clear it */ |
377 | static u16 gb_message_cport_unpack(struct gb_operation_msg_hdr *) |
378 | { |
379 | u16 cport_id = header->pad[0]; |
380 | |
381 | gb_message_cport_clear(header); |
382 | |
383 | return cport_id; |
384 | } |
385 | |
386 | /* |
387 | * Returns zero if the message was successfully queued, or a negative errno |
388 | * otherwise. |
389 | */ |
390 | static int message_send(struct gb_host_device *hd, u16 cport_id, |
391 | struct gb_message *message, gfp_t gfp_mask) |
392 | { |
393 | struct es2_ap_dev *es2 = hd_to_es2(hd); |
394 | struct usb_device *udev = es2->usb_dev; |
395 | size_t buffer_size; |
396 | int retval; |
397 | struct urb *urb; |
398 | unsigned long flags; |
399 | |
400 | /* |
401 | * The data actually transferred will include an indication |
402 | * of where the data should be sent. Do one last check of |
403 | * the target CPort id before filling it in. |
404 | */ |
405 | if (!cport_id_valid(hd, cport_id)) { |
406 | dev_err(&udev->dev, "invalid cport %u\n" , cport_id); |
407 | return -EINVAL; |
408 | } |
409 | |
410 | /* Find a free urb */ |
411 | urb = next_free_urb(es2, gfp_mask); |
412 | if (!urb) |
413 | return -ENOMEM; |
414 | |
415 | spin_lock_irqsave(&es2->cport_out_urb_lock, flags); |
416 | message->hcpriv = urb; |
417 | spin_unlock_irqrestore(lock: &es2->cport_out_urb_lock, flags); |
418 | |
419 | /* Pack the cport id into the message header */ |
420 | gb_message_cport_pack(header: message->header, cport_id); |
421 | |
422 | buffer_size = sizeof(*message->header) + message->payload_size; |
423 | |
424 | usb_fill_bulk_urb(urb, dev: udev, |
425 | usb_sndbulkpipe(udev, |
426 | es2->cport_out_endpoint), |
427 | transfer_buffer: message->buffer, buffer_length: buffer_size, |
428 | complete_fn: cport_out_callback, context: message); |
429 | urb->transfer_flags |= URB_ZERO_PACKET; |
430 | |
431 | trace_gb_message_submit(message); |
432 | |
433 | retval = usb_submit_urb(urb, mem_flags: gfp_mask); |
434 | if (retval) { |
435 | dev_err(&udev->dev, "failed to submit out-urb: %d\n" , retval); |
436 | |
437 | spin_lock_irqsave(&es2->cport_out_urb_lock, flags); |
438 | message->hcpriv = NULL; |
439 | spin_unlock_irqrestore(lock: &es2->cport_out_urb_lock, flags); |
440 | |
441 | free_urb(es2, urb); |
442 | gb_message_cport_clear(header: message->header); |
443 | |
444 | return retval; |
445 | } |
446 | |
447 | return 0; |
448 | } |
449 | |
450 | /* |
451 | * Can not be called in atomic context. |
452 | */ |
453 | static void message_cancel(struct gb_message *message) |
454 | { |
455 | struct gb_host_device *hd = message->operation->connection->hd; |
456 | struct es2_ap_dev *es2 = hd_to_es2(hd); |
457 | struct urb *urb; |
458 | int i; |
459 | |
460 | might_sleep(); |
461 | |
462 | spin_lock_irq(lock: &es2->cport_out_urb_lock); |
463 | urb = message->hcpriv; |
464 | |
465 | /* Prevent dynamically allocated urb from being deallocated. */ |
466 | usb_get_urb(urb); |
467 | |
468 | /* Prevent pre-allocated urb from being reused. */ |
469 | for (i = 0; i < NUM_CPORT_OUT_URB; ++i) { |
470 | if (urb == es2->cport_out_urb[i]) { |
471 | es2->cport_out_urb_cancelled[i] = true; |
472 | break; |
473 | } |
474 | } |
475 | spin_unlock_irq(lock: &es2->cport_out_urb_lock); |
476 | |
477 | usb_kill_urb(urb); |
478 | |
479 | if (i < NUM_CPORT_OUT_URB) { |
480 | spin_lock_irq(lock: &es2->cport_out_urb_lock); |
481 | es2->cport_out_urb_cancelled[i] = false; |
482 | spin_unlock_irq(lock: &es2->cport_out_urb_lock); |
483 | } |
484 | |
485 | usb_free_urb(urb); |
486 | } |
487 | |
488 | static int es2_cport_allocate(struct gb_host_device *hd, int cport_id, |
489 | unsigned long flags) |
490 | { |
491 | struct es2_ap_dev *es2 = hd_to_es2(hd); |
492 | struct ida *id_map = &hd->cport_id_map; |
493 | int ida_start, ida_end; |
494 | |
495 | switch (cport_id) { |
496 | case ES2_CPORT_CDSI0: |
497 | case ES2_CPORT_CDSI1: |
498 | dev_err(&hd->dev, "cport %d not available\n" , cport_id); |
499 | return -EBUSY; |
500 | } |
501 | |
502 | if (flags & GB_CONNECTION_FLAG_OFFLOADED && |
503 | flags & GB_CONNECTION_FLAG_CDSI1) { |
504 | if (es2->cdsi1_in_use) { |
505 | dev_err(&hd->dev, "CDSI1 already in use\n" ); |
506 | return -EBUSY; |
507 | } |
508 | |
509 | es2->cdsi1_in_use = true; |
510 | |
511 | return ES2_CPORT_CDSI1; |
512 | } |
513 | |
514 | if (cport_id < 0) { |
515 | ida_start = 0; |
516 | ida_end = hd->num_cports - 1; |
517 | } else if (cport_id < hd->num_cports) { |
518 | ida_start = cport_id; |
519 | ida_end = cport_id; |
520 | } else { |
521 | dev_err(&hd->dev, "cport %d not available\n" , cport_id); |
522 | return -EINVAL; |
523 | } |
524 | |
525 | return ida_alloc_range(id_map, min: ida_start, max: ida_end, GFP_KERNEL); |
526 | } |
527 | |
528 | static void es2_cport_release(struct gb_host_device *hd, u16 cport_id) |
529 | { |
530 | struct es2_ap_dev *es2 = hd_to_es2(hd); |
531 | |
532 | switch (cport_id) { |
533 | case ES2_CPORT_CDSI1: |
534 | es2->cdsi1_in_use = false; |
535 | return; |
536 | } |
537 | |
538 | ida_free(&hd->cport_id_map, id: cport_id); |
539 | } |
540 | |
541 | static int cport_enable(struct gb_host_device *hd, u16 cport_id, |
542 | unsigned long flags) |
543 | { |
544 | struct es2_ap_dev *es2 = hd_to_es2(hd); |
545 | struct usb_device *udev = es2->usb_dev; |
546 | struct gb_apb_request_cport_flags *req; |
547 | u32 connection_flags; |
548 | int ret; |
549 | |
550 | req = kzalloc(size: sizeof(*req), GFP_KERNEL); |
551 | if (!req) |
552 | return -ENOMEM; |
553 | |
554 | connection_flags = 0; |
555 | if (flags & GB_CONNECTION_FLAG_CONTROL) |
556 | connection_flags |= GB_APB_CPORT_FLAG_CONTROL; |
557 | if (flags & GB_CONNECTION_FLAG_HIGH_PRIO) |
558 | connection_flags |= GB_APB_CPORT_FLAG_HIGH_PRIO; |
559 | |
560 | req->flags = cpu_to_le32(connection_flags); |
561 | |
562 | dev_dbg(&hd->dev, "%s - cport = %u, flags = %02x\n" , __func__, |
563 | cport_id, connection_flags); |
564 | |
565 | ret = usb_control_msg(dev: udev, usb_sndctrlpipe(udev, 0), |
566 | GB_APB_REQUEST_CPORT_FLAGS, |
567 | USB_DIR_OUT | USB_TYPE_VENDOR | |
568 | USB_RECIP_INTERFACE, value: cport_id, index: 0, |
569 | data: req, size: sizeof(*req), ES2_USB_CTRL_TIMEOUT); |
570 | if (ret < 0) { |
571 | dev_err(&udev->dev, "failed to set cport flags for port %d\n" , |
572 | cport_id); |
573 | goto out; |
574 | } |
575 | |
576 | ret = 0; |
577 | out: |
578 | kfree(objp: req); |
579 | |
580 | return ret; |
581 | } |
582 | |
583 | static int es2_cport_connected(struct gb_host_device *hd, u16 cport_id) |
584 | { |
585 | struct es2_ap_dev *es2 = hd_to_es2(hd); |
586 | struct device *dev = &es2->usb_dev->dev; |
587 | struct arpc_cport_connected_req req; |
588 | int ret; |
589 | |
590 | req.cport_id = cpu_to_le16(cport_id); |
591 | ret = arpc_sync(es2, ARPC_TYPE_CPORT_CONNECTED, payload: &req, size: sizeof(req), |
592 | NULL, ES2_ARPC_CPORT_TIMEOUT); |
593 | if (ret) { |
594 | dev_err(dev, "failed to set connected state for cport %u: %d\n" , |
595 | cport_id, ret); |
596 | return ret; |
597 | } |
598 | |
599 | return 0; |
600 | } |
601 | |
602 | static int es2_cport_flush(struct gb_host_device *hd, u16 cport_id) |
603 | { |
604 | struct es2_ap_dev *es2 = hd_to_es2(hd); |
605 | struct device *dev = &es2->usb_dev->dev; |
606 | struct arpc_cport_flush_req req; |
607 | int ret; |
608 | |
609 | req.cport_id = cpu_to_le16(cport_id); |
610 | ret = arpc_sync(es2, ARPC_TYPE_CPORT_FLUSH, payload: &req, size: sizeof(req), |
611 | NULL, ES2_ARPC_CPORT_TIMEOUT); |
612 | if (ret) { |
613 | dev_err(dev, "failed to flush cport %u: %d\n" , cport_id, ret); |
614 | return ret; |
615 | } |
616 | |
617 | return 0; |
618 | } |
619 | |
620 | static int es2_cport_shutdown(struct gb_host_device *hd, u16 cport_id, |
621 | u8 phase, unsigned int timeout) |
622 | { |
623 | struct es2_ap_dev *es2 = hd_to_es2(hd); |
624 | struct device *dev = &es2->usb_dev->dev; |
625 | struct arpc_cport_shutdown_req req; |
626 | int result; |
627 | int ret; |
628 | |
629 | if (timeout > U16_MAX) |
630 | return -EINVAL; |
631 | |
632 | req.cport_id = cpu_to_le16(cport_id); |
633 | req.timeout = cpu_to_le16(timeout); |
634 | req.phase = phase; |
635 | ret = arpc_sync(es2, ARPC_TYPE_CPORT_SHUTDOWN, payload: &req, size: sizeof(req), |
636 | result: &result, ES2_ARPC_CPORT_TIMEOUT + timeout); |
637 | if (ret) { |
638 | dev_err(dev, "failed to send shutdown over cport %u: %d (%d)\n" , |
639 | cport_id, ret, result); |
640 | return ret; |
641 | } |
642 | |
643 | return 0; |
644 | } |
645 | |
646 | static int es2_cport_quiesce(struct gb_host_device *hd, u16 cport_id, |
647 | size_t peer_space, unsigned int timeout) |
648 | { |
649 | struct es2_ap_dev *es2 = hd_to_es2(hd); |
650 | struct device *dev = &es2->usb_dev->dev; |
651 | struct arpc_cport_quiesce_req req; |
652 | int result; |
653 | int ret; |
654 | |
655 | if (peer_space > U16_MAX) |
656 | return -EINVAL; |
657 | |
658 | if (timeout > U16_MAX) |
659 | return -EINVAL; |
660 | |
661 | req.cport_id = cpu_to_le16(cport_id); |
662 | req.peer_space = cpu_to_le16(peer_space); |
663 | req.timeout = cpu_to_le16(timeout); |
664 | ret = arpc_sync(es2, ARPC_TYPE_CPORT_QUIESCE, payload: &req, size: sizeof(req), |
665 | result: &result, ES2_ARPC_CPORT_TIMEOUT + timeout); |
666 | if (ret) { |
667 | dev_err(dev, "failed to quiesce cport %u: %d (%d)\n" , |
668 | cport_id, ret, result); |
669 | return ret; |
670 | } |
671 | |
672 | return 0; |
673 | } |
674 | |
675 | static int es2_cport_clear(struct gb_host_device *hd, u16 cport_id) |
676 | { |
677 | struct es2_ap_dev *es2 = hd_to_es2(hd); |
678 | struct device *dev = &es2->usb_dev->dev; |
679 | struct arpc_cport_clear_req req; |
680 | int ret; |
681 | |
682 | req.cport_id = cpu_to_le16(cport_id); |
683 | ret = arpc_sync(es2, ARPC_TYPE_CPORT_CLEAR, payload: &req, size: sizeof(req), |
684 | NULL, ES2_ARPC_CPORT_TIMEOUT); |
685 | if (ret) { |
686 | dev_err(dev, "failed to clear cport %u: %d\n" , cport_id, ret); |
687 | return ret; |
688 | } |
689 | |
690 | return 0; |
691 | } |
692 | |
693 | static int latency_tag_enable(struct gb_host_device *hd, u16 cport_id) |
694 | { |
695 | int retval; |
696 | struct es2_ap_dev *es2 = hd_to_es2(hd); |
697 | struct usb_device *udev = es2->usb_dev; |
698 | |
699 | retval = usb_control_msg(dev: udev, usb_sndctrlpipe(udev, 0), |
700 | GB_APB_REQUEST_LATENCY_TAG_EN, |
701 | USB_DIR_OUT | USB_TYPE_VENDOR | |
702 | USB_RECIP_INTERFACE, value: cport_id, index: 0, NULL, |
703 | size: 0, ES2_USB_CTRL_TIMEOUT); |
704 | |
705 | if (retval < 0) |
706 | dev_err(&udev->dev, "Cannot enable latency tag for cport %d\n" , |
707 | cport_id); |
708 | return retval; |
709 | } |
710 | |
711 | static int latency_tag_disable(struct gb_host_device *hd, u16 cport_id) |
712 | { |
713 | int retval; |
714 | struct es2_ap_dev *es2 = hd_to_es2(hd); |
715 | struct usb_device *udev = es2->usb_dev; |
716 | |
717 | retval = usb_control_msg(dev: udev, usb_sndctrlpipe(udev, 0), |
718 | GB_APB_REQUEST_LATENCY_TAG_DIS, |
719 | USB_DIR_OUT | USB_TYPE_VENDOR | |
720 | USB_RECIP_INTERFACE, value: cport_id, index: 0, NULL, |
721 | size: 0, ES2_USB_CTRL_TIMEOUT); |
722 | |
723 | if (retval < 0) |
724 | dev_err(&udev->dev, "Cannot disable latency tag for cport %d\n" , |
725 | cport_id); |
726 | return retval; |
727 | } |
728 | |
729 | static struct gb_hd_driver es2_driver = { |
730 | .hd_priv_size = sizeof(struct es2_ap_dev), |
731 | .message_send = message_send, |
732 | .message_cancel = message_cancel, |
733 | .cport_allocate = es2_cport_allocate, |
734 | .cport_release = es2_cport_release, |
735 | .cport_enable = cport_enable, |
736 | .cport_connected = es2_cport_connected, |
737 | .cport_flush = es2_cport_flush, |
738 | .cport_shutdown = es2_cport_shutdown, |
739 | .cport_quiesce = es2_cport_quiesce, |
740 | .cport_clear = es2_cport_clear, |
741 | .latency_tag_enable = latency_tag_enable, |
742 | .latency_tag_disable = latency_tag_disable, |
743 | .output = output, |
744 | }; |
745 | |
746 | /* Common function to report consistent warnings based on URB status */ |
747 | static int check_urb_status(struct urb *urb) |
748 | { |
749 | struct device *dev = &urb->dev->dev; |
750 | int status = urb->status; |
751 | |
752 | switch (status) { |
753 | case 0: |
754 | return 0; |
755 | |
756 | case -EOVERFLOW: |
757 | dev_err(dev, "%s: overflow actual length is %d\n" , |
758 | __func__, urb->actual_length); |
759 | fallthrough; |
760 | case -ECONNRESET: |
761 | case -ENOENT: |
762 | case -ESHUTDOWN: |
763 | case -EILSEQ: |
764 | case -EPROTO: |
765 | /* device is gone, stop sending */ |
766 | return status; |
767 | } |
768 | dev_err(dev, "%s: unknown status %d\n" , __func__, status); |
769 | |
770 | return -EAGAIN; |
771 | } |
772 | |
773 | static void es2_destroy(struct es2_ap_dev *es2) |
774 | { |
775 | struct usb_device *udev; |
776 | struct urb *urb; |
777 | int i; |
778 | |
779 | debugfs_remove(dentry: es2->apb_log_enable_dentry); |
780 | usb_log_disable(es2); |
781 | |
782 | /* Tear down everything! */ |
783 | for (i = 0; i < NUM_CPORT_OUT_URB; ++i) { |
784 | urb = es2->cport_out_urb[i]; |
785 | usb_kill_urb(urb); |
786 | usb_free_urb(urb); |
787 | es2->cport_out_urb[i] = NULL; |
788 | es2->cport_out_urb_busy[i] = false; /* just to be anal */ |
789 | } |
790 | |
791 | for (i = 0; i < NUM_ARPC_IN_URB; ++i) { |
792 | usb_free_urb(urb: es2->arpc_urb[i]); |
793 | kfree(objp: es2->arpc_buffer[i]); |
794 | es2->arpc_buffer[i] = NULL; |
795 | } |
796 | |
797 | for (i = 0; i < NUM_CPORT_IN_URB; ++i) { |
798 | usb_free_urb(urb: es2->cport_in.urb[i]); |
799 | kfree(objp: es2->cport_in.buffer[i]); |
800 | es2->cport_in.buffer[i] = NULL; |
801 | } |
802 | |
803 | /* release reserved CDSI0 and CDSI1 cports */ |
804 | gb_hd_cport_release_reserved(hd: es2->hd, ES2_CPORT_CDSI1); |
805 | gb_hd_cport_release_reserved(hd: es2->hd, ES2_CPORT_CDSI0); |
806 | |
807 | udev = es2->usb_dev; |
808 | gb_hd_put(hd: es2->hd); |
809 | |
810 | usb_put_dev(dev: udev); |
811 | } |
812 | |
813 | static void cport_in_callback(struct urb *urb) |
814 | { |
815 | struct gb_host_device *hd = urb->context; |
816 | struct device *dev = &urb->dev->dev; |
817 | struct gb_operation_msg_hdr *; |
818 | int status = check_urb_status(urb); |
819 | int retval; |
820 | u16 cport_id; |
821 | |
822 | if (status) { |
823 | if ((status == -EAGAIN) || (status == -EPROTO)) |
824 | goto exit; |
825 | |
826 | /* The urb is being unlinked */ |
827 | if (status == -ENOENT || status == -ESHUTDOWN) |
828 | return; |
829 | |
830 | dev_err(dev, "urb cport in error %d (dropped)\n" , status); |
831 | return; |
832 | } |
833 | |
834 | if (urb->actual_length < sizeof(*header)) { |
835 | dev_err(dev, "short message received\n" ); |
836 | goto exit; |
837 | } |
838 | |
839 | /* Extract the CPort id, which is packed in the message header */ |
840 | header = urb->transfer_buffer; |
841 | cport_id = gb_message_cport_unpack(header); |
842 | |
843 | if (cport_id_valid(hd, cport_id)) { |
844 | greybus_data_rcvd(hd, cport_id, data: urb->transfer_buffer, |
845 | length: urb->actual_length); |
846 | } else { |
847 | dev_err(dev, "invalid cport id %u received\n" , cport_id); |
848 | } |
849 | exit: |
850 | /* put our urb back in the request pool */ |
851 | retval = usb_submit_urb(urb, GFP_ATOMIC); |
852 | if (retval) |
853 | dev_err(dev, "failed to resubmit in-urb: %d\n" , retval); |
854 | } |
855 | |
856 | static void cport_out_callback(struct urb *urb) |
857 | { |
858 | struct gb_message *message = urb->context; |
859 | struct gb_host_device *hd = message->operation->connection->hd; |
860 | struct es2_ap_dev *es2 = hd_to_es2(hd); |
861 | int status = check_urb_status(urb); |
862 | unsigned long flags; |
863 | |
864 | gb_message_cport_clear(header: message->header); |
865 | |
866 | spin_lock_irqsave(&es2->cport_out_urb_lock, flags); |
867 | message->hcpriv = NULL; |
868 | spin_unlock_irqrestore(lock: &es2->cport_out_urb_lock, flags); |
869 | |
870 | /* |
871 | * Tell the submitter that the message send (attempt) is |
872 | * complete, and report the status. |
873 | */ |
874 | greybus_message_sent(hd, message, status); |
875 | |
876 | free_urb(es2, urb); |
877 | } |
878 | |
879 | static struct arpc *arpc_alloc(void *payload, u16 size, u8 type) |
880 | { |
881 | struct arpc *rpc; |
882 | |
883 | if (size + sizeof(*rpc->req) > ARPC_OUT_SIZE_MAX) |
884 | return NULL; |
885 | |
886 | rpc = kzalloc(size: sizeof(*rpc), GFP_KERNEL); |
887 | if (!rpc) |
888 | return NULL; |
889 | |
890 | INIT_LIST_HEAD(list: &rpc->list); |
891 | rpc->req = kzalloc(size: sizeof(*rpc->req) + size, GFP_KERNEL); |
892 | if (!rpc->req) |
893 | goto err_free_rpc; |
894 | |
895 | rpc->resp = kzalloc(size: sizeof(*rpc->resp), GFP_KERNEL); |
896 | if (!rpc->resp) |
897 | goto err_free_req; |
898 | |
899 | rpc->req->type = type; |
900 | rpc->req->size = cpu_to_le16(sizeof(*rpc->req) + size); |
901 | memcpy(rpc->req->data, payload, size); |
902 | |
903 | init_completion(x: &rpc->response_received); |
904 | |
905 | return rpc; |
906 | |
907 | err_free_req: |
908 | kfree(objp: rpc->req); |
909 | err_free_rpc: |
910 | kfree(objp: rpc); |
911 | |
912 | return NULL; |
913 | } |
914 | |
915 | static void arpc_free(struct arpc *rpc) |
916 | { |
917 | kfree(objp: rpc->req); |
918 | kfree(objp: rpc->resp); |
919 | kfree(objp: rpc); |
920 | } |
921 | |
922 | static struct arpc *arpc_find(struct es2_ap_dev *es2, __le16 id) |
923 | { |
924 | struct arpc *rpc; |
925 | |
926 | list_for_each_entry(rpc, &es2->arpcs, list) { |
927 | if (rpc->req->id == id) |
928 | return rpc; |
929 | } |
930 | |
931 | return NULL; |
932 | } |
933 | |
934 | static void arpc_add(struct es2_ap_dev *es2, struct arpc *rpc) |
935 | { |
936 | rpc->active = true; |
937 | rpc->req->id = cpu_to_le16(es2->arpc_id_cycle++); |
938 | list_add_tail(new: &rpc->list, head: &es2->arpcs); |
939 | } |
940 | |
941 | static void arpc_del(struct es2_ap_dev *es2, struct arpc *rpc) |
942 | { |
943 | if (rpc->active) { |
944 | rpc->active = false; |
945 | list_del(entry: &rpc->list); |
946 | } |
947 | } |
948 | |
949 | static int arpc_send(struct es2_ap_dev *es2, struct arpc *rpc, int timeout) |
950 | { |
951 | struct usb_device *udev = es2->usb_dev; |
952 | int retval; |
953 | |
954 | retval = usb_control_msg(dev: udev, usb_sndctrlpipe(udev, 0), |
955 | GB_APB_REQUEST_ARPC_RUN, |
956 | USB_DIR_OUT | USB_TYPE_VENDOR | |
957 | USB_RECIP_INTERFACE, |
958 | value: 0, index: 0, |
959 | data: rpc->req, le16_to_cpu(rpc->req->size), |
960 | ES2_USB_CTRL_TIMEOUT); |
961 | if (retval < 0) { |
962 | dev_err(&udev->dev, |
963 | "failed to send ARPC request %d: %d\n" , |
964 | rpc->req->type, retval); |
965 | return retval; |
966 | } |
967 | |
968 | return 0; |
969 | } |
970 | |
971 | static int arpc_sync(struct es2_ap_dev *es2, u8 type, void *payload, |
972 | size_t size, int *result, unsigned int timeout) |
973 | { |
974 | struct arpc *rpc; |
975 | unsigned long flags; |
976 | int retval; |
977 | |
978 | if (result) |
979 | *result = 0; |
980 | |
981 | rpc = arpc_alloc(payload, size, type); |
982 | if (!rpc) |
983 | return -ENOMEM; |
984 | |
985 | spin_lock_irqsave(&es2->arpc_lock, flags); |
986 | arpc_add(es2, rpc); |
987 | spin_unlock_irqrestore(lock: &es2->arpc_lock, flags); |
988 | |
989 | retval = arpc_send(es2, rpc, timeout); |
990 | if (retval) |
991 | goto out_arpc_del; |
992 | |
993 | retval = wait_for_completion_interruptible_timeout( |
994 | x: &rpc->response_received, |
995 | timeout: msecs_to_jiffies(m: timeout)); |
996 | if (retval <= 0) { |
997 | if (!retval) |
998 | retval = -ETIMEDOUT; |
999 | goto out_arpc_del; |
1000 | } |
1001 | |
1002 | if (rpc->resp->result) { |
1003 | retval = -EREMOTEIO; |
1004 | if (result) |
1005 | *result = rpc->resp->result; |
1006 | } else { |
1007 | retval = 0; |
1008 | } |
1009 | |
1010 | out_arpc_del: |
1011 | spin_lock_irqsave(&es2->arpc_lock, flags); |
1012 | arpc_del(es2, rpc); |
1013 | spin_unlock_irqrestore(lock: &es2->arpc_lock, flags); |
1014 | arpc_free(rpc); |
1015 | |
1016 | if (retval < 0 && retval != -EREMOTEIO) { |
1017 | dev_err(&es2->usb_dev->dev, |
1018 | "failed to execute ARPC: %d\n" , retval); |
1019 | } |
1020 | |
1021 | return retval; |
1022 | } |
1023 | |
1024 | static void arpc_in_callback(struct urb *urb) |
1025 | { |
1026 | struct es2_ap_dev *es2 = urb->context; |
1027 | struct device *dev = &urb->dev->dev; |
1028 | int status = check_urb_status(urb); |
1029 | struct arpc *rpc; |
1030 | struct arpc_response_message *resp; |
1031 | unsigned long flags; |
1032 | int retval; |
1033 | |
1034 | if (status) { |
1035 | if ((status == -EAGAIN) || (status == -EPROTO)) |
1036 | goto exit; |
1037 | |
1038 | /* The urb is being unlinked */ |
1039 | if (status == -ENOENT || status == -ESHUTDOWN) |
1040 | return; |
1041 | |
1042 | dev_err(dev, "arpc in-urb error %d (dropped)\n" , status); |
1043 | return; |
1044 | } |
1045 | |
1046 | if (urb->actual_length < sizeof(*resp)) { |
1047 | dev_err(dev, "short aprc response received\n" ); |
1048 | goto exit; |
1049 | } |
1050 | |
1051 | resp = urb->transfer_buffer; |
1052 | spin_lock_irqsave(&es2->arpc_lock, flags); |
1053 | rpc = arpc_find(es2, id: resp->id); |
1054 | if (!rpc) { |
1055 | dev_err(dev, "invalid arpc response id received: %u\n" , |
1056 | le16_to_cpu(resp->id)); |
1057 | spin_unlock_irqrestore(lock: &es2->arpc_lock, flags); |
1058 | goto exit; |
1059 | } |
1060 | |
1061 | arpc_del(es2, rpc); |
1062 | memcpy(rpc->resp, resp, sizeof(*resp)); |
1063 | complete(&rpc->response_received); |
1064 | spin_unlock_irqrestore(lock: &es2->arpc_lock, flags); |
1065 | |
1066 | exit: |
1067 | /* put our urb back in the request pool */ |
1068 | retval = usb_submit_urb(urb, GFP_ATOMIC); |
1069 | if (retval) |
1070 | dev_err(dev, "failed to resubmit arpc in-urb: %d\n" , retval); |
1071 | } |
1072 | |
1073 | #define APB1_LOG_MSG_SIZE 64 |
1074 | static void apb_log_get(struct es2_ap_dev *es2, char *buf) |
1075 | { |
1076 | int retval; |
1077 | |
1078 | do { |
1079 | retval = usb_control_msg(dev: es2->usb_dev, |
1080 | usb_rcvctrlpipe(es2->usb_dev, 0), |
1081 | GB_APB_REQUEST_LOG, |
1082 | USB_DIR_IN | USB_TYPE_VENDOR | |
1083 | USB_RECIP_INTERFACE, |
1084 | value: 0x00, index: 0x00, |
1085 | data: buf, |
1086 | APB1_LOG_MSG_SIZE, |
1087 | ES2_USB_CTRL_TIMEOUT); |
1088 | if (retval > 0) |
1089 | kfifo_in(&es2->apb_log_fifo, buf, retval); |
1090 | } while (retval > 0); |
1091 | } |
1092 | |
1093 | static int apb_log_poll(void *data) |
1094 | { |
1095 | struct es2_ap_dev *es2 = data; |
1096 | char *buf; |
1097 | |
1098 | buf = kmalloc(APB1_LOG_MSG_SIZE, GFP_KERNEL); |
1099 | if (!buf) |
1100 | return -ENOMEM; |
1101 | |
1102 | while (!kthread_should_stop()) { |
1103 | msleep(msecs: 1000); |
1104 | apb_log_get(es2, buf); |
1105 | } |
1106 | |
1107 | kfree(objp: buf); |
1108 | |
1109 | return 0; |
1110 | } |
1111 | |
1112 | static ssize_t apb_log_read(struct file *f, char __user *buf, |
1113 | size_t count, loff_t *ppos) |
1114 | { |
1115 | struct es2_ap_dev *es2 = file_inode(f)->i_private; |
1116 | ssize_t ret; |
1117 | size_t copied; |
1118 | char *tmp_buf; |
1119 | |
1120 | if (count > APB1_LOG_SIZE) |
1121 | count = APB1_LOG_SIZE; |
1122 | |
1123 | tmp_buf = kmalloc(size: count, GFP_KERNEL); |
1124 | if (!tmp_buf) |
1125 | return -ENOMEM; |
1126 | |
1127 | copied = kfifo_out(&es2->apb_log_fifo, tmp_buf, count); |
1128 | ret = simple_read_from_buffer(to: buf, count, ppos, from: tmp_buf, available: copied); |
1129 | |
1130 | kfree(objp: tmp_buf); |
1131 | |
1132 | return ret; |
1133 | } |
1134 | |
1135 | static const struct file_operations apb_log_fops = { |
1136 | .read = apb_log_read, |
1137 | }; |
1138 | |
1139 | static void usb_log_enable(struct es2_ap_dev *es2) |
1140 | { |
1141 | if (!IS_ERR_OR_NULL(ptr: es2->apb_log_task)) |
1142 | return; |
1143 | |
1144 | /* get log from APB1 */ |
1145 | es2->apb_log_task = kthread_run(apb_log_poll, es2, "apb_log" ); |
1146 | if (IS_ERR(ptr: es2->apb_log_task)) |
1147 | return; |
1148 | /* XXX We will need to rename this per APB */ |
1149 | es2->apb_log_dentry = debugfs_create_file(name: "apb_log" , mode: 0444, |
1150 | parent: gb_debugfs_get(), data: es2, |
1151 | fops: &apb_log_fops); |
1152 | } |
1153 | |
1154 | static void usb_log_disable(struct es2_ap_dev *es2) |
1155 | { |
1156 | if (IS_ERR_OR_NULL(ptr: es2->apb_log_task)) |
1157 | return; |
1158 | |
1159 | debugfs_remove(dentry: es2->apb_log_dentry); |
1160 | es2->apb_log_dentry = NULL; |
1161 | |
1162 | kthread_stop(k: es2->apb_log_task); |
1163 | es2->apb_log_task = NULL; |
1164 | } |
1165 | |
1166 | static ssize_t apb_log_enable_read(struct file *f, char __user *buf, |
1167 | size_t count, loff_t *ppos) |
1168 | { |
1169 | struct es2_ap_dev *es2 = file_inode(f)->i_private; |
1170 | int enable = !IS_ERR_OR_NULL(ptr: es2->apb_log_task); |
1171 | char tmp_buf[3]; |
1172 | |
1173 | sprintf(buf: tmp_buf, fmt: "%d\n" , enable); |
1174 | return simple_read_from_buffer(to: buf, count, ppos, from: tmp_buf, available: 2); |
1175 | } |
1176 | |
1177 | static ssize_t apb_log_enable_write(struct file *f, const char __user *buf, |
1178 | size_t count, loff_t *ppos) |
1179 | { |
1180 | int enable; |
1181 | ssize_t retval; |
1182 | struct es2_ap_dev *es2 = file_inode(f)->i_private; |
1183 | |
1184 | retval = kstrtoint_from_user(s: buf, count, base: 10, res: &enable); |
1185 | if (retval) |
1186 | return retval; |
1187 | |
1188 | if (enable) |
1189 | usb_log_enable(es2); |
1190 | else |
1191 | usb_log_disable(es2); |
1192 | |
1193 | return count; |
1194 | } |
1195 | |
1196 | static const struct file_operations apb_log_enable_fops = { |
1197 | .read = apb_log_enable_read, |
1198 | .write = apb_log_enable_write, |
1199 | }; |
1200 | |
1201 | static int apb_get_cport_count(struct usb_device *udev) |
1202 | { |
1203 | int retval; |
1204 | __le16 *cport_count; |
1205 | |
1206 | cport_count = kzalloc(size: sizeof(*cport_count), GFP_KERNEL); |
1207 | if (!cport_count) |
1208 | return -ENOMEM; |
1209 | |
1210 | retval = usb_control_msg(dev: udev, usb_rcvctrlpipe(udev, 0), |
1211 | GB_APB_REQUEST_CPORT_COUNT, |
1212 | USB_DIR_IN | USB_TYPE_VENDOR | |
1213 | USB_RECIP_INTERFACE, value: 0, index: 0, data: cport_count, |
1214 | size: sizeof(*cport_count), ES2_USB_CTRL_TIMEOUT); |
1215 | if (retval != sizeof(*cport_count)) { |
1216 | dev_err(&udev->dev, "Cannot retrieve CPort count: %d\n" , |
1217 | retval); |
1218 | |
1219 | if (retval >= 0) |
1220 | retval = -EIO; |
1221 | |
1222 | goto out; |
1223 | } |
1224 | |
1225 | retval = le16_to_cpu(*cport_count); |
1226 | |
1227 | /* We need to fit a CPort ID in one byte of a message header */ |
1228 | if (retval > U8_MAX) { |
1229 | retval = U8_MAX; |
1230 | dev_warn(&udev->dev, "Limiting number of CPorts to U8_MAX\n" ); |
1231 | } |
1232 | |
1233 | out: |
1234 | kfree(objp: cport_count); |
1235 | return retval; |
1236 | } |
1237 | |
1238 | /* |
1239 | * The ES2 USB Bridge device has 15 endpoints |
1240 | * 1 Control - usual USB stuff + AP -> APBridgeA messages |
1241 | * 7 Bulk IN - CPort data in |
1242 | * 7 Bulk OUT - CPort data out |
1243 | */ |
1244 | static int ap_probe(struct usb_interface *interface, |
1245 | const struct usb_device_id *id) |
1246 | { |
1247 | struct es2_ap_dev *es2; |
1248 | struct gb_host_device *hd; |
1249 | struct usb_device *udev; |
1250 | struct usb_host_interface *iface_desc; |
1251 | struct usb_endpoint_descriptor *endpoint; |
1252 | __u8 ep_addr; |
1253 | int retval; |
1254 | int i; |
1255 | int num_cports; |
1256 | bool bulk_out_found = false; |
1257 | bool bulk_in_found = false; |
1258 | bool arpc_in_found = false; |
1259 | |
1260 | udev = usb_get_dev(interface_to_usbdev(interface)); |
1261 | |
1262 | num_cports = apb_get_cport_count(udev); |
1263 | if (num_cports < 0) { |
1264 | usb_put_dev(dev: udev); |
1265 | dev_err(&udev->dev, "Cannot retrieve CPort count: %d\n" , |
1266 | num_cports); |
1267 | return num_cports; |
1268 | } |
1269 | |
1270 | hd = gb_hd_create(driver: &es2_driver, parent: &udev->dev, ES2_GBUF_MSG_SIZE_MAX, |
1271 | num_cports); |
1272 | if (IS_ERR(ptr: hd)) { |
1273 | usb_put_dev(dev: udev); |
1274 | return PTR_ERR(ptr: hd); |
1275 | } |
1276 | |
1277 | es2 = hd_to_es2(hd); |
1278 | es2->hd = hd; |
1279 | es2->usb_intf = interface; |
1280 | es2->usb_dev = udev; |
1281 | spin_lock_init(&es2->cport_out_urb_lock); |
1282 | INIT_KFIFO(es2->apb_log_fifo); |
1283 | usb_set_intfdata(intf: interface, data: es2); |
1284 | |
1285 | /* |
1286 | * Reserve the CDSI0 and CDSI1 CPorts so they won't be allocated |
1287 | * dynamically. |
1288 | */ |
1289 | retval = gb_hd_cport_reserve(hd, ES2_CPORT_CDSI0); |
1290 | if (retval) |
1291 | goto error; |
1292 | retval = gb_hd_cport_reserve(hd, ES2_CPORT_CDSI1); |
1293 | if (retval) |
1294 | goto error; |
1295 | |
1296 | /* find all bulk endpoints */ |
1297 | iface_desc = interface->cur_altsetting; |
1298 | for (i = 0; i < iface_desc->desc.bNumEndpoints; ++i) { |
1299 | endpoint = &iface_desc->endpoint[i].desc; |
1300 | ep_addr = endpoint->bEndpointAddress; |
1301 | |
1302 | if (usb_endpoint_is_bulk_in(epd: endpoint)) { |
1303 | if (!bulk_in_found) { |
1304 | es2->cport_in.endpoint = ep_addr; |
1305 | bulk_in_found = true; |
1306 | } else if (!arpc_in_found) { |
1307 | es2->arpc_endpoint_in = ep_addr; |
1308 | arpc_in_found = true; |
1309 | } else { |
1310 | dev_warn(&udev->dev, |
1311 | "Unused bulk IN endpoint found: 0x%02x\n" , |
1312 | ep_addr); |
1313 | } |
1314 | continue; |
1315 | } |
1316 | if (usb_endpoint_is_bulk_out(epd: endpoint)) { |
1317 | if (!bulk_out_found) { |
1318 | es2->cport_out_endpoint = ep_addr; |
1319 | bulk_out_found = true; |
1320 | } else { |
1321 | dev_warn(&udev->dev, |
1322 | "Unused bulk OUT endpoint found: 0x%02x\n" , |
1323 | ep_addr); |
1324 | } |
1325 | continue; |
1326 | } |
1327 | dev_warn(&udev->dev, |
1328 | "Unknown endpoint type found, address 0x%02x\n" , |
1329 | ep_addr); |
1330 | } |
1331 | if (!bulk_in_found || !arpc_in_found || !bulk_out_found) { |
1332 | dev_err(&udev->dev, "Not enough endpoints found in device, aborting!\n" ); |
1333 | retval = -ENODEV; |
1334 | goto error; |
1335 | } |
1336 | |
1337 | /* Allocate buffers for our cport in messages */ |
1338 | for (i = 0; i < NUM_CPORT_IN_URB; ++i) { |
1339 | struct urb *urb; |
1340 | u8 *buffer; |
1341 | |
1342 | urb = usb_alloc_urb(iso_packets: 0, GFP_KERNEL); |
1343 | if (!urb) { |
1344 | retval = -ENOMEM; |
1345 | goto error; |
1346 | } |
1347 | es2->cport_in.urb[i] = urb; |
1348 | |
1349 | buffer = kmalloc(ES2_GBUF_MSG_SIZE_MAX, GFP_KERNEL); |
1350 | if (!buffer) { |
1351 | retval = -ENOMEM; |
1352 | goto error; |
1353 | } |
1354 | |
1355 | usb_fill_bulk_urb(urb, dev: udev, |
1356 | usb_rcvbulkpipe(udev, es2->cport_in.endpoint), |
1357 | transfer_buffer: buffer, ES2_GBUF_MSG_SIZE_MAX, |
1358 | complete_fn: cport_in_callback, context: hd); |
1359 | |
1360 | es2->cport_in.buffer[i] = buffer; |
1361 | } |
1362 | |
1363 | /* Allocate buffers for ARPC in messages */ |
1364 | for (i = 0; i < NUM_ARPC_IN_URB; ++i) { |
1365 | struct urb *urb; |
1366 | u8 *buffer; |
1367 | |
1368 | urb = usb_alloc_urb(iso_packets: 0, GFP_KERNEL); |
1369 | if (!urb) { |
1370 | retval = -ENOMEM; |
1371 | goto error; |
1372 | } |
1373 | es2->arpc_urb[i] = urb; |
1374 | |
1375 | buffer = kmalloc(ARPC_IN_SIZE_MAX, GFP_KERNEL); |
1376 | if (!buffer) { |
1377 | retval = -ENOMEM; |
1378 | goto error; |
1379 | } |
1380 | |
1381 | usb_fill_bulk_urb(urb, dev: udev, |
1382 | usb_rcvbulkpipe(udev, |
1383 | es2->arpc_endpoint_in), |
1384 | transfer_buffer: buffer, ARPC_IN_SIZE_MAX, |
1385 | complete_fn: arpc_in_callback, context: es2); |
1386 | |
1387 | es2->arpc_buffer[i] = buffer; |
1388 | } |
1389 | |
1390 | /* Allocate urbs for our CPort OUT messages */ |
1391 | for (i = 0; i < NUM_CPORT_OUT_URB; ++i) { |
1392 | struct urb *urb; |
1393 | |
1394 | urb = usb_alloc_urb(iso_packets: 0, GFP_KERNEL); |
1395 | if (!urb) { |
1396 | retval = -ENOMEM; |
1397 | goto error; |
1398 | } |
1399 | |
1400 | es2->cport_out_urb[i] = urb; |
1401 | es2->cport_out_urb_busy[i] = false; /* just to be anal */ |
1402 | } |
1403 | |
1404 | /* XXX We will need to rename this per APB */ |
1405 | es2->apb_log_enable_dentry = debugfs_create_file(name: "apb_log_enable" , |
1406 | mode: 0644, |
1407 | parent: gb_debugfs_get(), data: es2, |
1408 | fops: &apb_log_enable_fops); |
1409 | |
1410 | INIT_LIST_HEAD(list: &es2->arpcs); |
1411 | spin_lock_init(&es2->arpc_lock); |
1412 | |
1413 | retval = es2_arpc_in_enable(es2); |
1414 | if (retval) |
1415 | goto error; |
1416 | |
1417 | retval = gb_hd_add(hd); |
1418 | if (retval) |
1419 | goto err_disable_arpc_in; |
1420 | |
1421 | retval = es2_cport_in_enable(es2, cport_in: &es2->cport_in); |
1422 | if (retval) |
1423 | goto err_hd_del; |
1424 | |
1425 | return 0; |
1426 | |
1427 | err_hd_del: |
1428 | gb_hd_del(hd); |
1429 | err_disable_arpc_in: |
1430 | es2_arpc_in_disable(es2); |
1431 | error: |
1432 | es2_destroy(es2); |
1433 | |
1434 | return retval; |
1435 | } |
1436 | |
1437 | static void ap_disconnect(struct usb_interface *interface) |
1438 | { |
1439 | struct es2_ap_dev *es2 = usb_get_intfdata(intf: interface); |
1440 | |
1441 | gb_hd_del(hd: es2->hd); |
1442 | |
1443 | es2_cport_in_disable(es2, cport_in: &es2->cport_in); |
1444 | es2_arpc_in_disable(es2); |
1445 | |
1446 | es2_destroy(es2); |
1447 | } |
1448 | |
1449 | static struct usb_driver es2_ap_driver = { |
1450 | .name = "es2_ap_driver" , |
1451 | .probe = ap_probe, |
1452 | .disconnect = ap_disconnect, |
1453 | .id_table = id_table, |
1454 | .soft_unbind = 1, |
1455 | }; |
1456 | |
1457 | module_usb_driver(es2_ap_driver); |
1458 | |
1459 | MODULE_LICENSE("GPL v2" ); |
1460 | MODULE_AUTHOR("Greg Kroah-Hartman <gregkh@linuxfoundation.org>" ); |
1461 | |